Index: openacs-4/packages/acs-tcl/tcl/utilities-procs-naviserver.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/utilities-procs-naviserver.tcl,v
diff -u -r1.4.2.7 -r1.4.2.8
--- openacs-4/packages/acs-tcl/tcl/utilities-procs-naviserver.tcl	21 Sep 2020 11:28:56 -0000	1.4.2.7
+++ openacs-4/packages/acs-tcl/tcl/utilities-procs-naviserver.tcl	23 May 2022 22:01:33 -0000	1.4.2.8
@@ -68,14 +68,19 @@
     {-secure f}
     {-domain ""}
     {-path "/"}
+    {-samesite lax}
     name
 } {
     Un-sets a cookie.
 
     @see ad_get_cookie
     @see ad_set_cookie
 } {
-    ns_deletecookie -domain $domain -path $path -replace t -secure $secure -- $name
+    if {[::acs::icanuse "ns_deletecookie -samesite"]} {
+        ns_deletecookie -domain $domain -path $path -replace t -secure $secure -samesite $samesite -- $name
+    } else {
+        ns_deletecookie -domain $domain -path $path -replace t -secure $secure -- $name
+    }
 }
 
 #